Loom for weaving double tapes



June 8, 1937. E. R. HOLMES 2,082,890

LOOM FOR WEAVING DOUBLE TAPES F iled Dec. 24, 1955 4 Shets-Sheet 1 Inventor Ubridqe R. Ho\mes June 8, 1937. E. R. HOLMES LOOM FOR WEAVING DOUBLE TAPES Filed Dec. 24, 1935 4 Sheets-Sheet 2 Inventor Ubridqe. R .Hoh'nes Attorneys June 1937'. E. R. HOLMES 2,082,890

LOOM FOR WEAVING DOUBLE TAPES v Filed Dec. 24, 1935 4 Sheets-Sheet 5 FIE. .7

Inventor E \bridge. R. Hohnea Attor hey s June 8, 1937. E. R. HOLMES LOOM FOR WEAVING DOUBLE TAPES Filed Dec. 24; 1955 4 Sheets-Sheet 4 Inventor Ubridqe R. Ho\mes Attorneys Patented June 8, 1937 om'rso smres PATENT OFFICE LOOM FOR WEAVING' DOUBLE TAPES Application December 24, 1935, SerialNo. 56,023

15 Claims.

This invention relates to improvements in apparatus and method for weaving double tapes of the kind used for instance in the manufacture of Venetian blinds and it is an important. object 5 of the invention to make improved provision for holding the crossing threads during the Weaving operation.

In my Patent No. 2,025,866 I have shown a loom for weaving Venetian blind tapes wherein in the cross threads .are advancedwith respectto the.

fells of the two Webs by a rod mounted on the lay and controlled to move to a position where it can move the cross warps forwardly at periodic intervals. The advancer rod moves backwardly 15 with the lay and as a result there is likelihood that the filling threads will not hold the crossing warps tightly enough as the lay recedes from its foremost position. This is more likely to be true where the tension of the crossing warps is rela- 20 tively high, and results in an uneveness of length in the cross threads.

It is an important object of my present invention to provide means for holding the crossing warps under tension during a brief period after 25 they have been moved forwardly by. the advancer rod. This result I, accomplish as set forth hereinafter by mounting the crossing warp advanceron a relatively stationary part of the loom, the rearward motion of the lay having no effect on slackening the crossing warps. With such a construction the advancer is held in its forward position during the several successive crossings of the warp following the beat of they loom on which the crossing warps are moved 35 forwardly.

It is necessary to manipulate the rod so that it can be moved rearwardly along a path out of alignment with the crossing warp threads and then be moved behind and into alignment with 40 them. It is a further object of my invention to provide a carriage for the advancer slidable relatively to a fixed part of the loom, such as the breast beam, and utilize actuators carried by the lay to give said advancer a part at least of the motions necessary to place the crossing warps.

It is another object of my invention to provide an improved method by which the crossing warps can be controlled, the method involving a final step which maintains pressure on the crossing 50 warp threads a sufficiently ,long time to permit them to be caught tightly by the ground webs.

This part of the method is independent of lay motion and represents an improvement over known procedures. r

55 With these and other objects in view which will appear as the description proceeds my invention resides inthe combination and arrangement of parts hereinafter described and set forth.

In the accompanying drawings, wherein a con- 5 venient embodimentof my invention is set forth,

Fig. 1 is a vertical section through a loom having my invention applied thereto,

Fig. 2 is a view similar to the upper left hand part of Fig. 1 on an enlarged scale, the breast beam being shown in section,

Fig. 3 is a plan view taken in the direction of arrow 3, Fig. 2, showing the slide and warp crossing advancer. held in normal forward position,

Fig. 4 is a vertical section on line 4-4 of Fig. 3,

Fig. 5' is .a vertical section on line 5-5 of Fig. 3,

a Fig. 6 is a view similar to Fig. 3 but with the slide released and shown in rear position, and

' Fig. '7 is a front elevation taken in the direction of arrow 1,.Fig; 2.

Referring particularly to Fig. 1, I have shown a loom frame I0 having two independent warp systems W and W for the upper and lower webs C and'C', respectively, these webs being manipulated in any desired manner by harness frames H. A third system of warp threads B is provided to be divided, each half to be passed from one web to the other to provide the cross supports which hold the slots of Venetian blinds. These crossing warps are: controlled by'front harness frames F.

A lever ll pivoted to the loom frame at 12 has a web roll I3 under which the crossing warps pass and this lever isconnected at its rear end with anupright rod M the lower end of which is attachedto a lifter arm 15 pivoted at I 6 to the frame; A cam ll moving with a ratchet l8 has a scroll surface to cooperate with a lifting shoe IS on the arm [5. 'Ihescroll cam and ratchet move about a fixed stud Zlland on which is also mounted an actuating lever 2| having a feed pawl 22 for the ratchet. The forward part of lever 2| is attached to an upwardly extending flexible actuator cord 23' given periodic feeding motions by mechanism not set forth herein but occurring at regular intervals during the loom operation, dependent upon the distance between crossings. As weaving continues the slow rotation of the cam will elevate arm. [5 and in turn move the roll l3 rearwardly. At the desired beat of the loom the shoe [9 will fall from the high to the low part of the scroll cam to slacken the crossing warps and permit them to be moved forwardly. The warp feeding features of my invention are set forth in order to= illustrate the improvements to V at its upper end as at 32 to an arm 33 secured be described and of themselves form no part of my present invention.

The lay 25 is mounted on a lay sword 26 moving about a rocker shaft 21 and there is provided a connector 28 lying between the crank shaft 29 and the lay. In order to insure parallel motion of the lay I may employ a link 30 pivoted at its lower end about a fixed axis 3|. and attached to and projecting rearwardly from the lay.

The lay will have a set of shuttle blocks for each web space, only one set being shown herein. A block plate is secured to therear of the lay and projects upwardly therefrom to support top and bottom shuttle guide blocks 36 and 31, respectively, between which is a third guide block 38. The upper and lower shuttles S and S. move between the blocks in well-known manner customary in narrow ware looms. The loom has a breast beam toward which the lay and shuttles move on the forward beat of the loom and provision not. shown but well understood is provided for taking the double web from the breast beam and winding it on cloth rolls. The usual reed R is provided and extends across the sheds of both sets of ground warps.

The matter thus far described may be similar to the structure set forth in the aforesaid patent and of itself forms no part of my present invention, the feeding of the slackener warps and the manipulation of all .of the warps by the harness frames being effective to produce the desired pattern.

In carrying my invention into effect I mount a guide stand 45 on the breast beam in fixed position and provide it with a rounded cloth guide d6 over which the webs pass. A web spacing unit l! is secured to and projects rearwardly from the stand, as shown in Figs. 2 and 4, this: unit comprising two substantially parallel arms 48 and 49 supporting upper and lower cross bars 50 and 5|, respectively, to define a space between which the webs pass. The cross bars limit separation of the webs and by fixing a definite space by which the webs can be separated make it possible for the mechanism to be described to pull off the same amount of crossing warps on all crossing beats of the loom.

A slide housing has spaced parallel slots 56 in the vertical walls 55 thereof to receive guide rails 5'I on the sides of the stand 55. An upright stud 58 secured to the slide or housing 55 has pivoted thereto a lever 59, an arm'BIl attached to a tension spring 5f, the forward end of which is anchored with respect to the slide 55. The lever 59 has a stop shoulder B'Zfor abutment with an adjustment screw 63 supported by the slide, and the rear part of lever 59 extends downwardly as at B4 to support a depending actuator lug 65. A crossing warp advancer 65 is adjustably secured in vertical extension 64 of lever 59 and extends rearwardly terminating in a lateral bend 61 which is the part that actually engages the crossing warps.

The stand 55 has a stud TI] on which is pivoted a trigger lever 'lI extending forwardly for engagement with a stop shoulder I2 on one of the walls of the slide housing 55. Integral with the lever H is a hub I3 in which. is adjustably set an actuating finger M. A tension spring I5 is interposed between the lever II and a fixed part of the stand 45 and serves normally to hold the trigger ii and it in the fullline position shown in Fig. 3. In this position the slideis positively heldin forward retracted position.

Mounted on the stud 10 is a sheave I6 around which is trained a flexible actuator cable I! one end of which is attached as at 18 to the slide, as shown in Fig. 3, while the other end is connected to a tension spring I9, the farther end of which is held by a stud fastened to the breast beam. When the parts are in the full line position shown in Fig. 3 the spring I9 is stretched and exerts a constant effort tending to move the slide 55 rearwardly. The latter will be held in its retracted position on all beats of the loom except those on which the crossing warps pass each other as they extend from one web to the other.

Levers 59 and II are rocked by means of a control plate slidable on a base 86 secured to the front of the lay, as shown particularly in Figs. 2 and '7. The base 86 is provided with two spaced guide screws 8'! which pass through guide slots 88 in the plate 85, thereby determining the direction in which the slide moves in a vertical direction relatively to the lay. A tension spring 89 has the upper end thereof fixed with respect to the slide 85 and the lower end attached preferably to a structure fixed with respect to the lay, such as a stud 90. Under ordinary conditions gravity will act to hold the slide plate 85 down, but I prefer to use a spring to attain greater precision in the return of the slide to normal down position. A resetting screw 8I adjustable back and forth in an arm 82 depending from slide housing 55 is adapted to engage an upward extension 83 on the base 86 as the lay advances to reset said housing, as will be described hereinafter.

As shown in Fig. '7 the upper right hand part of control plate 85 carries an actuating lug 9| which is normally below the actuator stud 65 when plate 85 is down, while the upper left hand part of the plate carries a second lug 92 having a cam face 93 normally below finger I4. With the plate 85 down, therefore, the lay can move forwardly without disturbing stud 55 and finger 14.

A small bracket 95 depends from the lay and has pivoted thereto as at 96 a lever 91 carrying a grooved roll 98. The forward end of lever 9! may be reduced as at 99 and lies under the bottom of plate 85 but over a retaining clip IEO secured in vertically adjusted position on plate 85, as indicated in Fig. '7. The lever 9'! will normally be in its low position, being thus maintained both by gravity and the action of spring 89.

An actuator cam I05 for the roll 98 is pivoted as at I06 to an upright I51 stationary with respect to the loom structure. A spring I98 interposed between the cam and the upright tends to hold the former in the position shown in Fig. '7, stop elements I65 limiting movement of the cam I05 to the right as viewed in said Fig. '7. The left hand part of cam IE5 is attached to a flexible connector IIG having an intermediate tension spring III. This connector III] passes under a sheave IIZ moving about a fixed axis and extends rearwardly to rise behind a second sheave I I3 also movable about a fixed axis. The connector II 0 then extends upwardly to control mechanism, such as a pattern chain lever not shown but acting in timed relation with the slackening movement of cross bar I3. Under normal conditions spring I08 holds the cam I95 out of alignment with the roll 98.

In operation, during normal running of the loom between crossing beats for the crossing Lil warps, the advancer 66 will lie between the webs and assume a position substantially the same as that shown in Fig. 3', being thus yieldingly held by spring. BI. Trigger II will be in looking position relatively to shoulder I2 on the slide housing, holding the latter forward, and the control slide plate 85 will be down with cam 05 out of alignment with roll 98. When an indication is given for a shifting of the crossing warps; this indication coming at a. time when the lay is in relatively rear position, flexible connector IIO will be pulled in a direction to moye cam I into vertical alignment with the roll 98, as shown in dotted lines in Fig. '7; As the lay advances the roll 98 will ride up along the rear inclined surface I20 of the cam I05 and in doing so will rock lever 91 about its center 96 in a clockwise direction as viewed in Fig. 2, thereby causing the reduced extension 99 to elevate the control plate 85 relatively to the lay. This raises lugs 9i and 92 into horizontal alignment with stud 65and finger I4, respectively.

As the lay continues to advance engagement of lug 9| with the stud 65 will rock lever 59 from the full to the dotted line position shown in Fig. 3, thereby retracting the advancer from a position between the webs. Lever 59 rocks because of the fact that the stud 65 is offset laterally from pivot 58 in a direction at right angles to the lay motion. At about the same time the inclined surface 93 of lug 92 will move finger I4 from thefull to the dotted line position of Fig. 3, thereby rocking the trigger II so that it moves out of holding relation with respect to the shoulder I2. Thereupon contraction of spring I9 causes the flexible cable E3 to exert a rearward force on the slide housing 55, and the latter will move toward the lay until the adjustable stop screw 8| strikes the extension 83 of the base plate 86. As the lay recedes, continued contraction of spring I9 will cause rearward motion of the slide and the latter will move from the position shown in Fig. 3 to that shown in Fig. 6.

During rearward. lay motion engagement is maintained between the lug SI and the actuator stud 65, thus making it possible for the advancer to move rearwardly without interference with the crossing warp threads which at this time are extending from their webs of origin to the op-' posite web and are crossed, as suggested in Fig. l. Rearward movement of the slide housing 55 continues until the advancer is slightly behind the point of crossing of the two sets of crossing warps, after which stop lugs I25 on the slide 55 engage correspondingstops I26 on the stand 45.

As the lay continues to recede the lug 9| draws away from the center 58 and the spring BI rocks lever 59 in a counter clockwise direction as viewed in Fig. 6 from the full to the dotted line position, thereby inserting the advancer into the sheds behind the point of crossing of the crossing warps. The action of inclined surface 99 on finger I4 is temporary and operative only F when the lay is in extreme forward position.

As soon as the lay has moved back a short distance from front center spring l5 becomes effective to move trigger II against the adjacent depending wall of slide 55.

When the lay is in its rearward position control of the cam I05 is released and spring I08 thereupon returns it to the full line position shown in Fig. '7. The dwell surface I30 of cam I05 is long enough to maintain the slide plate 85 raised until after the bar 5! has been moved to the dotted-position shown in Fig. 6, afterwhich the roll 98 moves down the incline I20 andthe control slide plate 85' descends to its normal lowered position.

As the lay moves forwardly after reaching back center the lugs 9| and 92 :are below the positions where they can engage the corresponding elements 65 and I4, and lever 59 will therefore remain in the position shownin dotted line position in Fig. 6% the slide 55 moves forwardly by engagement between the lay carried extension 83 and resetting screw 8|.

During this forward motion of the slide 55 the advancer 61 will engage the crossed warps as indicated in Fig. 4 and move them forwardly a distance which is determined by the-desired space between the webs when in use. In order to vary this distance the advancer may be adjusted back and forth relatively to the lever 59, as suggested by the check nuts I32 shown in Fig. 2.

As the slide 55 reaches its extreme forward position with the lay pushing it the trigger II will first slide up along the inclined front part of shoulder II and then under action of spring 75 will snap down behind said shoulder to hold the slide locked in forward retracted position. The slide and therefore the advancer will remain in this position after the lay leaves front center and moves rearwardly, and will remain in this position until the next crossing warp B is called. The advancer is therefore able to withstand any strains which may be imposed upon the crossing warps incident to shedding operations immediately following the resetting of slide 55. In this way assurance is given that the crossing warps will not slip with respect to their webs and the latter will therefore be accurately and uniformly spaced when used in a Venetian blind .due to the fact that all of the crossing warps are of substantially the same length.

As weaving continues the webs will advance with respect to the cross bars 55 and advancer, thereby carrying the crossing warps frontwardly from the advancer, but this movement of the crossing warps away from the advancer will not occur until after said warps have been firmly woven into the webs. The retention of the crossing warps is an important step in the method of their control.

From the foregoing it will be seen that I have provided mechanism for holding the crossing warps in forward position during the picks immediately following a crossing operation of the loom, thereby permitting tight weaving of said warps into their respective webs and insuring uniformity of spacing of the webs when the latter are put to the use for which they are ultimatel designed. It will also be seen that this result is accomplished by mounting the advancer which controls the crossing warps on a part which is stationary with respect to the loom during those times when it is necessary to hold the crossing warps against slippage with respect to the webs. It will further be seen that the control for the advancer is exercised through a plate vertically slidable on the lay and that advancer in responding to the several controls which'determine its motion moves from between the webs, then while still retracted moves rearwardly with slide 55,

warps are held against rearward slippage rela' tively to the webs.

Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed, but what I claim is:

1. In a double shuttle loom, means to form top and bottom sheds of ground warps, a reciprocating reed to move forwardly to beat up filling in both sheds, a crossing warp to extend from one shed of ground warps to the other, means to move the crossing warps to a position in advance of the reed when the latter beats up filling in the ground sheds, and a lock to hold said means in forward position when the reed moves rearwardly.

2. In a double shuttle loom operating with an upper set of ground warp threads to form a top web and a lower set of ground warp threads to form a bottom web, a set of crossing warps to pass from one ground set to the other ground set, a reciprocating reed to move forwardly to beat up shots of filling lying between the ground warps, means to move the crossing warps forwardly relatively to the webs, and a lock to hold said means in forward position when the reed moves rearwardly.

3. In a double shuttle loom weaving two spaced webs, means to form a shed for each web, each shed meeting its web at the fell thereof, harnesses to move the crossing warps from one fell to the shed corresponding to the other fell, a reciprocating reed to move forwardly to beat filling into each shed, a crossing warp advancer to move the crossing warps forwardly relatively to the fells, and lock means to hold the advancer forward between the webs and in advance of the fells when the reed moves rearwardly.

i. In a double shuttle loom operating with two sets of ground warps to form two ground sheds which meet at the fells of the latter and operating with a set of crossing warps, means to move the crossing warps from one set of ground warps to the other set, a crossing warp advancer movable forwardly from a position behind the crossing warps to a position in advance of the fells, and means to lock said advancer normally in the position in advance of the fells to hold said crossing warps against rearward movement.

5. In a double shuttle loom operating with an upper set of ground warp threads to form a top web and a lower set of ground warp threads to form a bottom web, a set of crossing warps to pass from one ground set to the other ground set,

a reed to beat up shots of filling lying between the ground warps, a crossing warp advancer normally located forwardly between the webs, mechanism to move said advancer to a position behind the crossing warp threads and in advance of the reed and thereafter move said advancer to normal position between the webs, and retaining means to hold the advancer in normal forward position.

6. In a double shuttle loom, means to form top and bottom sheds of ground warps, a reed to beat up filling in both sheds, a crossing Warp to extend from one shed of ground warps to the other, a crossing warp advancer, a lock to hold the advancer normally at rest in forward position,

' mechanism effective to unlock and move the advancer rearwardly to a position behind the crossing warps and thereafter move said advancer forwardly in front of the reed to engage and move the crossing warps forwardly on a given beat of the loom, and means to cause the lock to move to locking position relatively to the advancer to maintain said advancer and crossing warps in forward position during succeeding beats of the loom.

'7. In a double shuttle loom operating with an upper set of ground warp threads to form a top web and a lower set of ground warp threads to form a bottom web, a set of crossing warps to pass from one ground set to the other ground set, a reed to beat up shots of filling lying between the ground warps, a crossing warp advancer, a lock operative to retain the advancer normally in a position between the webs, and mechanism to unlock and move the advancer rearwardly from normal position to a position behind the crossing warps and thereafter move the advancer forwardly in front of the reed to move the crossing warps to positions between the webs, and means thereupon effective to move the lock to holding position relatively to the advancer to hold the latter and crossing warps in forward position.

8. In a double shuttle loom operating with an upper set of ground Warp threads to form a top web and a lower set of ground warp threads to form a bottom web, a set of crossing warps to pass from one ground set to the other ground set, a reed to beat up shots of filling lying between the ground warps, a crossing warp advanced, holding means to maintain the advancer normally stationary between the webs, and a train of mechanism operative to disable the holding means and then move said advancer rearwardly to a position behind the crossing warps and in front of the reed, said train of mechanism subsequently operative to move the advancer forwardly in front of the reed to move the crossing warps forwardly relatively to the webs, and means to return the holding means to holding relationship with the advancer to hold the latter in forward position during succeeding beats of the loom.

9. In a double shuttle loom operating with two sets of ground warps to form two ground sheds which meet at the fells of the latter and operating with a set of crossing warps, means to move the crossing warps from one set of ground warps to the other set, a crossing warp advancer, means to lock the advancer in forward position in advance of the fells, means to move the lock to unlocking position, mechanism to effect rearward movement of the advancer on a given beat of the loom and place said advancer behind the cross warps, other means to move the advancer forwardly to move the crossing warps to positions in advance of the fells, and means thereafter operative to cause the lock to move into holding relation with respect to said advancer.

10. In a double shuttle loom operating with two sets of ground warps to form two ground sheds which meet at the fells of the latter and operating with a set of crossing warps, means to move the crossing warps'from one set of ground warps to the other set, a crossing warp advancer, means to move said advancer forwardly from a position behind the crossing warps on a given beat of the loom to a position in advance of the fells, and means to hold said advancer in forward position in front of said fells during a plurality of beats of the loom subsequent to said given beat.

11. In a double shuttle loom operating with two sets of ground warm -to form two ground sheds which meet at the fells of the latter and operating with a set of crossing warps, means to move the crossing warps from one set of ground warps to the other set, a lay movable toward and Lil from the fells, a crossing warp advancer normally in forward position between and in advance of the fells, means to move the advancer rearwardly to a position behind the crossing warps when the lay is in a relatively rearward position, means carried by the lay thereafter effective to move the advancer forwardly to normal position, and a lock to hold said advancer in normal forward position.

12. In a double shuttle loom operating with two sets of ground warps to form two ground sheds which'meet at the fells of the latter and operating with a set of crossing warps, means to move the crossing warps from one set of ground warps to the other set, a crossing warp advancer, a lock to hold said advancer normally between and in advance of the fells, a lay, means operative on a given beat of the loom to move the advancer rearwardly to a position behind the crossing warps, and means carried by the lay and operative on said given beat of the loom to move said advancer forwardly into holding relation with said lock, the latter retaining the advancer and crossing warps in forward position during beats of the loom subsequent to said given beat.

13. In a double shuttle loom operating with two sets of ground warps to form two ground sheds which meet at the fells of the latter and operating with a set of crossing warps, means to move the crossing warps from one set of ground warps to the other set, a crossing warp advancer, a carrier therefor, a lock to hold the advancer and carrier normally forwardly with the advancer in front of the fells, a lay movable toward and from the fells, a controller on the lay normally in position to be inoperative with respect to the advancer and carrier, means operative on, a given beat of the loom to place the controller in operative position during a single forward beat of the lay, the latter thereupon becoming effective on said forward motion to unlock the carrier and also move the advancer laterally to a position at one side of the fell, means to move the carrier and advancer rearwardly during the first part of the following rearward movement of the lay, other means to move the advancer to a position behind the crossing warps, means carried by the lay to have operative engagement with the carrier to move the latter and advancer together with the crossing warps forwardly on the next forward movement of the lay, the controller being in normal inoperative position, and means to thereupon render the lock operative to hold the carrier and advancer in forward position during subsequent beats of the loom.

14. In a double shuttle loom operating with two sets of ground warps to form two ground sheds which meet at the fells of the latter and operating with a set of crossing warps, means to move the crossing warps from one set of ground warps to the other set, a crossing warp advancer, a carrier therefor, a lock to hold the carrier and advancer forwardly with the latter between and in front of the fells, a lay movable toward and from the fells, a controller on the lay normally in inoperative position, means operative on a single given beat of the loom to move said controller to operative position, the controller simultaneously unlocking said carrier and moving the advancer laterally to a position at one sided the fells due to forward motion of the lay, means to move the unlocked carrier rearwardly as the lay moves backwardly, means to move the ad-' vancer into a position behind the crossing warps when the carrier is rearward, means thereafter operative to move the controller to inoperative position before the next complete forward motion of the lay, and means on the lay operative on said next forward beat of the lat to move the carrier forwardly into locking relation with respect to said lock to move the advancer and crossing warps forwardly to a position in front of the fells, said lock being effective to retain the carrier and advancer in forward position during subsequent beats of the loom.

15. The method of weaving spaced webs connected by crossing warps, said method consisting in providing crossing warps and a system of warps for each web, crossing the crossing warps from each web to the other web at periodic intervals, advancing the point of crossing of the crossing warp threads to a position between the webs on a given beat of the loom to draw off crossing warps, and maintaining the crossing point of the crossing warps in said forward position independently of the webs for a succession of beats of the loom following said given beat.

ELBRIDGE R. HOLMES. 

